Math Fun Library 


Question : 
What
are Unnatural Numbers ? 
Answer : 
There is no such term called unnatural numbers, but there is a term called negative numbers. 
The introduction of negative
numbers is due to the need for subtraction to be performable without restriction. In the case of positive numbers the
subtraction a  b = c can only be carried out if a is greater than b. If, on the other hand, a is smaller than b we define
c = (b  a). 
For example, 7  9 = (2). Here the 'sign' on the left hand side of the equation represents an operation, and
on the right hand side it forms part of the number itself. 
In the case of the positive numbers the associated sign + may be
omitted, but such is not the case with negative numbers. 